This function is used to define the contact interface between blank and a tool. In most cases, *CONTACT_FORMING_ONE_WAY_SURFACE_TO SURFACE, is utilized for contact between all tooling and blank. The user can modify the contact interface for individual tools.
To modify the default contact interface setting, click on the DEFINE CONTACT button illustrated in Figure 11.2.1 to display the TOOLS CONTACT dialog box as shown in Figure 11.2.3.
Figure 11.2.3 Define Contact dialog box
CONTACT TYPE
Select the CONTACT TYPE by clicking on the drop down button to display the list, and select the desired type.
NOTE: Nine commonly used contact interfaces in sheet metal forming are offered in eta/DYNAFORM. They are:
1. AUTO-NODES-TO-SURF
2. AUTO-ONE-WAY-SURF-TO-SURF
3. AUTO-SURF-TO-SURF
4. FORMING-NODES-TO-SURF
5. FORMING-ONE-WAY-SURF-TO-SURF
6. FORMING-SURF-TO-SURF
7. NODES-TO-SURF
8. ONE-WAY-SURF-TO-SURF
9. SURFACE-TO-SURFACE
If SMOOTH option is selected, the program will automatically add SMOOTH option behind the selected contact type and add the corresponding card.
DEFINE CONTACT PARAMETERS
This function allows the user to set the contact parameters such as static friction, damping coefficient, soft constraint, etc.
NOTE: Refer to the LS-DYNA User's Manual for detailed information about each contact interface and its associated parameters.